Two California teens planned to storm their high school and blow away classmates around the anniversary of the Columbine massacre, authorities revealed yesterday. The two 17-year-old boys plotted to attack Summerville HS in Sonora next Thursday – Adolf Hitler’s birthday and a year after the rampage at Columbine HS – or possibly a few days sooner. But Tuolumne County Sheriff Dick Rogers said it didn’t appear the boys – booked on conspiracy to commit murder – were copying Columbine. “They had been planning this for more than a year. Since before Columbine,” Rogers said.